Alloy steel



Patented Dec. 14, 1937 at high temperatures.

ALLOY STEEL Byramji D. Saklatwalla, Grafton, Pa.

1 No Drawing.

4 Claims.

a great degree of hardness at ordinary temperatures, although it can otherwise handled with For most purposes temperature carbon ranges as giv The self-hardening properties of this steel are derived by the use of comparatively low amounts the so-called stainless type are be worked, machined and ease. where resistance to high approximately or even as high as The cost of relatively cheap elements, namely, chromium,

dium, cobalt. tungsten In the production of and the like, which has unduly increased the cost of the steel thus produced. By the proper relationship o1 molybdenum and 66 copper in the presenc e of chromium, it is pos- Application March 6, 1936, Serial No. 67,508

sible to control the degree of air hardening that within the less self-hardening.

Steels made according to my invention contain the following elements within the ranges specifled below:

Percent .03 to 1.5 .75 to 8.0

Silicon .5 to less than 2.0'

.15 to less than 5.0 Molybdenum .6 to 3.0 Manganese .10 to 2.0

The balance of the steel is substantially all iron with the exception of incidental impurities such as phosphorus and sulphur.

I have found that for general construction purposes where a material for high temperature use is required, steelscoming within the following ranges give very satisfactory results:

Percent Carbon .08 to .40, Chromium 2.5 to 5.0 .5 to 1.0

.30 to 1.5 Molybdenum .65 to 1.5 Manganese .10 to 1.0

case if the hardness were derived merely by incontent. Also, it is the 1 have found that tools, dies and the like according to my invention are obtained to best ad'-v vantage by compositions railing within the following ranges:

Percent Carbon -4. .60 to 1.25 Chromium 3.0 to 6.0 Silicon .5 to.1.5 Copper .3 to 1.5 Molybdenum .6 to 3.0 Manganese .10m 1.0

molybdenum .65% to 2; An alloyv consisting of chromium 3% to 8%, copper 2% to less-than 5%, molybdenum .6% to 1%, carbon .l%

to,25%, manganese .'1% to 1%,

silicon .5% to less than 1%, and the balance being iron with the exception of incidental impurities such as phosphorus and sulphur.

3. An alloy consisting of hromium 3.0% I to;

6.0%,copper .3% to 1.5%", molybdenum .6% to 3.0%, carbon .60% to 1.25%.manganese .10% to 1.0%, silicon '.5%' to 1.5%, and the. balance being iron with the exception of incidental impurities such as phosphorus and sulphur.

4. An alloy consisting of chromium 2.5%,to

5.0%, copper 30% to 1.5%,,m0lybdenum .65% to 1.5%, carbon 08% to .40%, manganese, .10% to 1.0%, silicon.5% to 1.0%, v iron with the exception of incidental impurities such as phosphorus and sulphur, said alloy being characterized by air hardening properties combined with high creep value at increased temperatures together with ductility and machinability.

BYRAM-ll n. sam'rwamn.

II and the balance being 7 I 

